What is the percent by mass of water in Na2SOa 10H20?total mass of element in compoundUse%Elementx 100molar mass of compoundO 5.59%O 11.26%44.08%O 55.92%

Answers

Answer 1

Answer: Molar mass Na₂SO₄. 10H₂O = 322.19 g/mol

Molar mass H₂O = 18.0

% Element = molar mass / total mass x 100

% Element = 18 / 322,19 x 100

% Element = 5.59 %

Answer A

hope this helps!

Answer 2

Answer:

Answer:

The answer is D.55.92%

Explanation:

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Heating zinc sulfide in the air causes the formation of

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Zinc sulfoxide? I think this right I am not sure

If the pressure, volume, and temperature of a gas are known, which can most likely be found by using the ideal gas law

Answers

the ideal gas law equation is as follows

PV = nRT

where P - pressure

V - volume

n - number of moles

R - universal gas constant

T - temperature

so if the pressure, volume and temperature are already known

we are left with n and R

since R is the universal gas constant that has a known fixed value then R too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

A.) the molar amount of gas

Hope it helps!

If the Ka of a monoprotic weak acid is 5.4 × 10-6, what is the pH of a 0.25 M solution of this acid?

Answers

The first step is to write the balanced equation of the dissociation of the monoprotic weak acid. This can be assumed to have 1:1 stoichiometric relationships, so the equation and ICE chart are given by:

      HA ---> H^+ + A^-
initial    0.25 0 0
change       -x x x
equilibrium    0.25-x x x

This gives an expression for Ka given by:

Ka = (x)^2/(0.25-x) = 5.4x10^-6
x = 1.159x10^-3 = [H+] = [A-]

pH = -log[H+] = -log[1.159x10^-3] = 2.936

You may normally expect a slow reaction if a low activation energy is required.

Answers

The statement is false. A low activation energy does not signifies a slower reaction rather it may mean that the reaction would proceed faster. A low activation energy means a low energy requirement for the reaction to occur which results to much faster production of products.

Answer:

False

Explanation:

Which substance below will exhibit hydrogen bonding between the molecules of the substance? a. CH₄
b. HBr
c. HCl
d. H₂O
e. H₂

Answers

I think it might just might be e

A sample of water is heated from 10.0 degrees Celcius to 15.0 degrees Celcius by the addition of 125 Joules of heat. What is the mass of the water?

Answers

Answer:

125 = 5*4.186*m

m = 125 / 5*4.186 = 5.97g of water.

Explanation:

The water is increased by 5 degrees. This means that for every gram of water, it takes 5*4.186 J to increase the temperature by 5 degrees, aka 5*4.186 J/g

hope this help:)

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